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| Square Footage | Furnace BTU |
|---|---|
| 1,000-1,200 sq. ft. Home | 40,000 - 60,000 BTU |
| 1,200-1,500 sq. ft. Home | 60,000 BTU |
| 1,500-1,800 sq. ft. Home | 60,000 - 80,000 BTU |
| 1,800-2,500 sq. ft. Home | 80,000 - 100,000 BTU |
| 2,500-3,500 sq. ft. Home | 100,000 to 120,000 BTU |
Answer 5 quick questions about your heat pump symptoms and get a likely diagnosis with recommended next steps.
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Note: This diagnosis is based on common symptom patterns and is for informational purposes only. A certified HVAC technician should inspect your system for an accurate diagnosis.
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GET FREE QUOTES| Symptom | Likely Cause | DIY or Pro? |
|---|---|---|
| Not heating / blowing cold air in heat mode | Low refrigerant, defrost cycle, thermostat iss | Pro (refrigerant) / DIY (thermostat) |
| Outdoor unit covered in ice | Defrost cycle failure, low refrigerant, airflow blockage | DIY check / Pro if persists |
| Short cycling (turns on/off frequently) | Oversized unit, dirty filter, refrigerant issue | DIY (filter) / Pro (refrigerant) |
| Loud banging or clanking noise | Loose fan blade, debris in outdoor unit, failing compressor | Pro required |
| Not cooling in summer | Low refrigerant, dirty coils, thermostat set incorrectly | DIY (thermostat/coils) / Pro |
| High electricity bills | Low refrigerant, dirty filter, aging system, air leaks | DIY (filter) / Pro (refrigerant) |
| Code Type | Typical Meaning | Action |
|---|---|---|
| Thermistor / Sensor Error | Temperature sensor malfunction | Call technician |
| Communication Error | Indoor/outdoor unit not communicating | Check wiring / Call tech |
| Compressor Error | Compressor overheating or failing | Call technician immediately |
| Defrost Error | Defrost cycle not completing | Check airflow / Call tech |
| Fan Motor Error | Indoor or outdoor fan issue | Check for obstructions / Call tech |
Several causes: the system may be in defrost mode (a normal temporary condition), the reversing valve may be stuck, refrigerant may be low, or the outdoor temperature may be below the unit's rated operating range. If it's not defrost mode and persists more than 30 minutes, call an HVAC technician.
A whooshing or gurgling sound when the system switches between heating and cooling modes is the reversing valve changing position — this is completely normal. You may also hear refrigerant flow sounds during startup, which is also normal. Loud banging, clanking, or grinding noises are not normal and require professional inspection.
HVAC professionals recommend annual heat pump servicing, ideally in September before the heating season. The service ensures the defrost system, refrigerant levels, electrical components, and filters are all in top condition before the cold Canadian winter arrives.
A standard diagnostic service call typically costs $100–$200 in most Canadian cities. Annual maintenance tune-ups (non-emergency) typically run $150–$300. If refrigerant is needed, expect to pay an additional $200–$500 depending on the type and amount required.
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